Laboratory for ChemoMetrics, Vienna (Austria) MS - Chemometrics - COSIMA

Summary of Results: Software Simulation of TOF-SIMS

Example: Reflector Potential

Introduction	Method	Software SimTof
K and C3H3	Primary Ion Distribution	Reflector Potential

Aim of the example

Influence of the potential U_Refl in the ion reflector on the peak profile.

Scheme of the ion reflector as used in the COSIMA instrument (simplified).

Input

For details see Method.

Secondary ions: mass 100, initial kinetic energy parameter E₀ = 10 eV

Number of secondary ions: 10000

Channel width for collecting and counting secondary ions: 1 ns

Result

Urefl = 90V	Urefl = 94V	Urefl = 100V
m/Dm = 2 780	m/Dm = 5 480	m/Dm = 1 820

Dm, peak width at half height

A potential of 94 V is best for the compensation of different initial kinetic energies of the secondary ions.

Introduction	Method	Software SimTof
K and C3H3	Primary Ion Distribution	Reflector Potential

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Last update 2000-12-03